The influence of a silvopastoral system composed of Bolsa de Pastor (Zeyheria tuberculosa) on in vitro kinetics of ruminal fermentation of Brachiaria brizantha cv. Marandu was evaluated at Cerrado bioma, in the years 2006 and 2007. The silvopastoral was established in 1982, by natural regeneration of tree species in red-yellow oxisols. The trials on kinetics of ruminal fermentation were carried out in a split-plot design with three replicates. The silvopastoril system and the monoculture of Brachiaria were allocated as plots and the harvest periods as the split-plots. Kinetics of ruminal fermentation in the systems were similar. However, during the rainy season, the forage was highly fermentable in comparison to the transition season. The forage harvested during the dry season showed lower fermentability.
animal nutrition; pastures; shading
